Differences between const and readonly
| Sno | const | readonly |
| 1 | Can't be static. | Can be instance level or static |
| 2 | evaluated at design time | evaluated at run time |
| 3 | Initialized at declaration | Initialized at declaration and in constructor |
| 4 | must be of integral type or enumeration | In addition it can have complex types with new keyword and enumerations are not allowed |

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